Join Date: Jan 2007
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Bladder tanks are not all that volume efficient and don't have the life of a rigid tank. You could have a rigid tank made to fill the space.
Or you could make a large access hole with cover in the existing tank, so that you can get an arm in to clean it.
Check that the rancid flavour is not coming from the existing pipework, its not much use changing the tank if the old pipe work remains.